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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62a426342389171dea5452927016c7bfecf3b4ea49edc016f4ea0d56f2bc48a4' 
  AND token = 'bnBA+4MtgV1+JFAn7IfnewgU26+2D3fmV9ZMYFscv5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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