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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08759764da56eb54f0d9798311d0e9ffa215b777b0e2225067f4de1d347f278d' 
  AND token = 'LntCs/OSU73pWu+hRL9SPMVyBnLfl3uNfQyZWh/seXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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