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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '301be3a286c194bd9e3d8a96a9574b6eb307e71269ffe4404325662c6ed931da' 
  AND token = '8uvvcKP7+SXSLaKCnNI3HFt2unsAsbne70yTobY/8uk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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