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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '359c160fd87c4dc24824c305f7955de1358205be5d4549a30e861a150e54db83' 
  AND token = '8jBQ1xicvW7MikmzEd3KfOZkXEYVL1hvKXEhDkTHt/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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