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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '600784718de95fa0ee1646b568d1f0976aa00ab3b86a6880700e1dcb54d3c893' 
  AND token = 'VhLaQXuepfpGWUAGBloQUWve4FI1LrLuIm1lGhCTHBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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