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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5368a3851d8a2282d1e5aea1ff866eabbc7179aa62c20e69f30f61b934796093' 
  AND token = 'lwDm3xQbbtlj5gSnbasz44UGWFWEJkq6250y/+HsOO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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