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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30d7d24db16503c04e7f7ec47f088fafd04e2603e0d5dae95d1e2ddeb3074ff1' 
  AND token = 'CV9gEP1xEl4tnnBtWLQ25UrqzkZnUQg87bgiaooTsVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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