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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0aee4a90004db21111e01a9f48f9540fe92243fb28d5c94e122e7f8b0b4e72e' 
  AND token = 'tfmJgiqHcoH82d0tR30OeK+p2mLZiLQqdvgWASNURxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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