SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1483d07c2b2dd97295d44d313e719064d10bc5955861eda59164f8fed4f7d27' 
  AND token = '+ILynVVkh6+6Dl4j4jxGsuJwshGeiHoEJJ/pbIgjvDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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