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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c84ab59748e07a27ca089e1f0f7f6d49ea2e06136bddd26293405aac8edef50c' 
  AND token = 'ZI210y3TePObkhvcy5EMyDgbW7d89oM86P5EAEJuv+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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