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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9b196e01a930037a4add801fc9c99d997e265ba9b5cfcefb4937a411720664e' 
  AND token = 'uO8gKV3VzlK2/29nyfeJ70DN64yRYvEf+0W7hDwfSVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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