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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c59df708f4e3731516fe711db2b6f3ac339b125c92c768087133df5093be57ae' 
  AND token = 'c0veoqvWs6N/iPQrjFtOOxU+WYTciBmbhjyaScPTxYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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