SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a0648b93edaa17cc550a57fac6d217386987c2b58d466395d174970f6b306e9' 
  AND token = 'lXVVQuKZ0w4eYgynlvQU1EcPfEwaURuIyXDKOp/QhQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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