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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cca4c4bfcac2b5647eebc5a1e3d184a53eac4b6a9e375238e5c978f78e660fc2' 
  AND token = '5hnFY3h2USyrHBqVtlu7XwuYfBTdfpAe/8cNYT5Bavc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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