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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23a969872706b57ac9227c9e2c5ddb68c2fe1c494b68da86d418a8ce82ceb521' 
  AND token = 'bUJpE/nHe1GPUBBpIfnCnlsCmGvf9IaM36ribhGmzas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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