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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '911ff3de18a2985b439e566d6a15bec69d7a5a09081ace0ae99b15da63f46671' 
  AND token = 'kaYBBoop2nbtNzgm33GxjiW0Bc7iGYh20VQ2Hi8IaJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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