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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2fdb003e077d8d7bebbb48458a584913da76a8a8efd33f87f5426b9ab6708e9' 
  AND token = 'IuQ6L0ZJ7loHdqoONO//IU+X8+GlIXGoHzac2zs/ZaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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