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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b64a68eb07678204ed44cbeb467d56bf470fd50e2b5fa9f4525b63431bb95eb7' 
  AND token = 'noZ4VZ18wE2oH7HmJhpFUM7q6kp4CqToM+2Qftnc30w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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