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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c93266c8abc8f6e9433829a0bb9304cfcf53f81ff8deab75a6f3d407822d937' 
  AND token = '2jPiMHS4SgN6R92uX/lsXDhyUo1jI9xffOz8fjmOjAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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