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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84215b7ad314659369b40003c0660f45db61d609b98be4a7578dbd4f54440e56' 
  AND token = '8PM2GZq93YQAMKRMxiaGWpNmf9NhOVbKiBwA385YkTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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