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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bccda7c73fcf9a584846779e851517aacd81efe875e0068ba7441add6f80d3f' 
  AND token = 'vxoeGCstS+AL9drrcXB9zvG6qwZUOoD8jY3jKtnvW04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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