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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5a3c6e6c89ba4d40d59cc35c6b3f48ea0009d31ec4a31b82f0949dc23b0f957' 
  AND token = 'hqFmSAd+QRxIf1CtzUZneMFa69eCjDV1Drb7MZHFhJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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