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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a50eb6584e4ab0500b6524850a3bed29658be98b8953c65ec6dc73117355359c' 
  AND token = 'JK9rfnab6PnVdAjMc1YI6tKqX1PXsJ1Frj9vcS86dck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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