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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91e922fbd3c0b9dfbb8c991b0b3760f4894db6c15ad0d7754d2b66a7b8d5bc70' 
  AND token = 'aLTQByis+H2wNkhisqKRElOT8nLho2hpcDW0F72VJtg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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