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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9df06f05f05035b4cc165b6a3347d0488489a2283913346a34e7521c2b423127' 
  AND token = 'zw8hegnd37Se2eY6knwQA33F8Tw8S3UbZZlP9oP2Q70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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