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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ebaa7acb5e21356370b4c4c7e160fe1f2d1cb972e768190038950d1c01add1a' 
  AND token = 'CnfG7FerOKKzxN3Rg3opKB/TK3/rGKuGlkenrZRdIlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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