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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fc3ddb36e1599e66cbc806ad98597bd0f62bac1ffa3b49d1c7e4d9804dd294e' 
  AND token = 'A9uzwI/2bjWPZ0aY4BghcscSzRq5WOyzv4D2c7qfxKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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