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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9690dd1fd39db0a5c47b45f3814644b3ad8147ebc818b9a64ea83970483a3d71' 
  AND token = '5meJa/aAVmC+U1KboEKg1A1IAhGnWyCO1/skXYVddVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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