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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '365e98ae5567c104cf21775be2fd257dd743178c26e4bd98d34928847b06354a' 
  AND token = 'HWl/aglbHeSnb953FfMvC3R8HTCieG8h2awG2KoThZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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