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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f4ec2d55cbdd42a10ef91a49d6e368885d25fd30c912694b673fcd6ed6ed32b' 
  AND token = 'ISrfv+efXSe87V6+8USmvOXRjg7JRcPFbdcM58XCGjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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