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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73cf98de9ca07436403c04a80d2e12d00d59c84b2046d928cc33db8de737a413' 
  AND token = '8P89LUYD+69dtuaDuPEPJSEYiXqm2+xnf84DVNyZMLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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