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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39bb85acd562cf7ac0590ce950804c13c021ff22051c2275d167692e42d931ac' 
  AND token = '1qNZciPTnq19zBNmaXt6eshI3oVGFtJCZoN+ppCcfTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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