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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69bf20ab304b493ff3ab9cee144d28da8f736f240c3d30bf371b1bf21f83945b' 
  AND token = 'mCMVw/7o7iCLD7ot9f7PpzWOjw8zbDee3oVKPYRtwjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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