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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '962e5823571bc185471c623ca32ebd5b3e5945413ed85f48fcfd3aadc92c2f37' 
  AND token = '3YrVNlCCSBl8zPInmIBrHBeC2pl+7+LEPTCf6N6ybkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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