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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3438c331bc65be96f947ea574adce162378e6e0b46dfd892c4f12ca77c6ada3' 
  AND token = 'eqbJySUS45Fe1plEdfKf6hXLCXm32iJMLcP8aV1b8A8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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