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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5109019b9d756e91b998f895c4bd11ce01f0bd8164baf8be637abddd495aaaf' 
  AND token = 'qed72dg77ktpYoSWs3X0bUix4ljPYLxGZO7SzKqB8Kg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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