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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5773701cc287f1b8c4232804c04c8db29753caecada89e996201fc881bf5da42' 
  AND token = 'aiX+OdS259FYIyoKWAHEipOexWuAUmDC7fhaxN+W1P0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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