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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fba9a3b85922ae8e402c6aa5b4346d33b39371a8afe3243271ceb3a5f73ce68' 
  AND token = 'zdGQTQ2XdSbmvimEUZR4O6dRF79XHavwDY38Yb0lX4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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