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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd99dc73a488d36c1d0b3fd79a84d5f8dc60da66442dd65198f205aefc2e8e66f' 
  AND token = 'wHqTRcUkyte/VJp0jNT8t1W/CeEzZZ3wH+txOifKbvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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