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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '464141e8896cb2bacfcf15c0381854d7b1ee5601819550052a8c1bc7bf891f69' 
  AND token = 'DwcMp2gUbqsqxd+xXtqvev+84X6mfH3U1Wvez5jERwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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