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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65731cda5a426e2fc07b28c1f7a45fc0dafdd1f7a821aa725681c0cb4823d967' 
  AND token = '7sUneXqxzu/UE6R9PfmlZTGGWWrWQfz01Q16mqaANY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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