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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eff8032d7a85c8e454b1cf13a0b853d030a572e17627e0a7e22bb5335885975c' 
  AND token = '2c6mGURne0y+/PEirzhrrJeuLXwH5VL55Y9XRPQhCzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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