Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb50b849cd47e0243e7ae96a61ba5e8f8b965009bac08119344154f6620c2557' 
  AND token = '6nkZ6kVkpL+FJ44+VwFuPpuzvGTTQ1N2aRLIQiNR7cI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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