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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '357776a535560559cd0fcb25d57c078280ac55e719e05f8d37072e9342d0e9e8' 
  AND token = 'Ttyp6f83X0SUleig5ghYT6KZKSlmaAr9Iqe1tkE0IHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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