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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c97e3de85ed54a5a28a5997af6a10233a654f9f6a052409ff3e5f776ef52b8c' 
  AND token = 'yqnNEJZEVywen/kaGkXuxSpkE7quluoM35KZjUfGb2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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