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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '491b24cb4a57faf9cf0d4a36284cec79b9681d4342fc019a6f51125e6a0e58e5' 
  AND token = 'LUh+E7GhIuO+9w93+OHco4OUggdY+cKdMywZoEM4lAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00072

JSON explain

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