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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '893cfabd22c6d91017ff9e4e7d405f0dda7b767d96f388467cd6e203a696c9bd' 
  AND token = 'cd0k2OuK3A5UaXhNehsxHc5RkkMlD+cr8QRQJD2hNXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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