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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cd4efba37f6ac7fddd56870887d8f3099d8693f032c10e67a9bd2d9dd915988' 
  AND token = 'MqBpo9wUaHuXa0iQgJmifZcd0a+msWue2K/hWZPlsyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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