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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae8643ac1e0c4c69c6607424e51aed19718e2c666ddc7db4eed35714954f6df5' 
  AND token = 'FP1prtyreZbj7rAkr7F597QJugOTDj2MCcOqiZ4ZeW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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