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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cfadca6a534a8f88c6ca21f9c6c2561ae44e7de575af4a6936ec5d387283fe3' 
  AND token = 'X4zCWxh4wic0h3lhEvu+Li/QIMJnMOXagmvsVWC52Jc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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