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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f8a72aad8b2baa427de764ae9b52919b5d7feffabfb41f0e964f018d4868717' 
  AND token = 'Qo3VNh0xuD4njdu+wdm/qIcro8CwFSOkWWxC9OMbiuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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