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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56147d66ff939a0062808e4f8f50c257c43ec3d687ada6f52bf5cd46cbe5d261' 
  AND token = 'DLZZ51Ccvp1QA03z25stCuuNK8ZrJGnFa7POi5MSXC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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