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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b91fe034a9b4c7e16e5701a354cc8fb07192cbb54ad96a1e9e08c519b78f6fcb' 
  AND token = 'sB03Hugn3SxSAQVgNcRuK2taNaAZ3/Yp3g+5KzvGsA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}