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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bef57f4a7b072367cf165fed558307edf71d62a9217a5f14246c9aeac59f3cf' 
  AND token = 'MdbhhKVT2OhhZH1UxR2Q+wDN83GUSl+t/1uU1fEDNmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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