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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63cc4b9fe9c6487279896987ac185ed33acd5d5bfc8c993aef5b1bc22de82ff0' 
  AND token = 'gbQJt7Pkxdj3xPlP1PXjQPR+NYJusuJu2Q1NlErCBYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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