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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e6440012b0a359a8d485f842dd7df18d1e79356eb8315c32dd77aeef2bcad75' 
  AND token = 'QQAO8PrvBZSN97Gdoyh48bc4FqG4cftKFRDFKtdZnY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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