SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f708652c8dab09a8bab3bade5b1408f4b810e2d1eeeb9f0dacd64d3e17771d6' 
  AND token = 'lh9PgDB++8oQJJ6G0h+lXnI/OskzHcpZbh/mPZVOrFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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