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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa1a1b942ad8b101cacff13920610d243b4de99cf1a12d8a7b62e67b8f88cc94' 
  AND token = '9kY2tC/aFbyyTlLtVpCY8+aJ4jVcm6CgbK+EjGElRwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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