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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bb0f43f595d70ffc122f4563e347ee874853c46c3f5dee1787ac3c833a6118c' 
  AND token = 'rHa43dln9M3AcofzP4FaulkxHdBe3YS5TGHU7PhffOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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