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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68e9c9e4eeaa60eb966ded678860686dabdc2fdd4dbd225ca731b9f6ccc9081d' 
  AND token = 'ge+LkS+caHfwRRI/O/FXvtSKIdzjyOKnpNc02heUY9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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