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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd08c069d3bcd58a29100cdcf430eedcb182d64f7dea17dca4d4c4c401d8b48f6' 
  AND token = 'VumdK/c5cX5FgdDyTFJyV2yg6l00Tmbtm8Hie3tNNsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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