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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abb9fef828f641bf7d11a5d296bcd9667e736a983040e886f8f1aac8802ead96' 
  AND token = 'jGkT4cNueLHJR9+zHNpkbFR/xbZFFnidJ87GGwSr18c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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