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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20685e33bb28695b89ff343a9e9b7bb6e138c4ebfb264d408abe0f79f14ec220' 
  AND token = 'xoJI0wnFQSe1/bNA7PFc5WYA9TkhFYD/bCar2V3yfKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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