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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c4f9840747a7dc0197dc1f5d1b0a4bcfd40b9db9dc6b985c10a95cfa1e399f7' 
  AND token = 'IB8zs69x6MqglauV6V3xayRjq5J9eoyxr6QnwK1Txyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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