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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '752b5986600b76012eb4b6c540620545c989371fe205688d027a7b9d0809a77c' 
  AND token = 'E6Y8HME96yJE5cHtGAgqR4fFFMHAUAYuzTZm965LpVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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