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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '420846458a498efc1270d471b92a26d5c03cd8b65626ee662ca75a9a8cb18803' 
  AND token = 'ebrDaKuCC9UFatJzJdXZ9cRFwQ3rhTQrUEh0sSEXI+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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