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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a73eac7c36c2d06c15a30f61207d199f447f152c1a838de73c0c60ea47ccdb83' 
  AND token = '+cJ03zluKrdrLMX1JsxPH8CIOaYSDgQ82fL0+HKBlTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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