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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e3675fa284bb3039af9f65ac182ed179504d9353da0dc4725a71dba1f0036ea' 
  AND token = '3lYhu3qWb15zmc9jkAZe9EOt7Ei025F+iFJiJRlMtSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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