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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a793102fdfe23fe4aa608e1b14aacdf3aa58ad1daa50700ce4ddcdd2a02b2428' 
  AND token = 'LRv1gqafG0z8MCoF1MwFSnDd9IG6wsC4/+YglXmjTag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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