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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '427d49afce1df9a3b923d2205a0721c318f20f1118e6ce8fe740ef919d4c658c' 
  AND token = 'U9VCFhOAMqAfe4zCOF1r7umzqxxoOSQ1pWkZbcQ0WCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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