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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4c4c842884d86a4f069ba8aea5adb2f4b28a118c4590a344579148cd001aa55' 
  AND token = 'vOOILFBtPXTKDPLyXiG5hkq0TUd1a2OCC24POJMzKqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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