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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69e034deff6ff0c5202b59882f0be9cfa93f70555d5deec4c256bf266b926c9f' 
  AND token = 'h6/4zWu1YgP+uZsoE52rMDn7QLRPpCaPR2N7/qX4yRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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