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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f62a4c0c40c2eaea75567c477b213d53427cbe5bf1c87f9a390a4c3be1fa6743' 
  AND token = 'YLz5wd4BvCeXzh6r2InX6lYt3se0EUrNNCKIIYQoTmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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