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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a5fd8818d137f9a08dbf0d76878a09d9b5068ec8f61ee0578521686092b93f7' 
  AND token = 'gqu1ns4UKo/lvtdI8xvX61IoZkeR59QG2E/GjJTpsK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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