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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c0b9775b9c9b401720b4d6754f5bb56eef502609ccfe23a55ff06bbcd1acc34' 
  AND token = 'oxsnZU5L5jc7HBRMNv/OUruO5iLeioznl8Kv2ULtifI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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