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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b20d1f00bc9e296953525457e4b7757f37bbc60f40e54a66958cf53e47038e8' 
  AND token = 'XuCTvvIkY3DsTgz5hDfnuEPcJNgZsFfe7g6ZZKb1stI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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