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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41179384d005a4c028a42a59444b4bfcc88d86a72a3d158c3fd3a7ad18186265' 
  AND token = '4SXax7yFINMvZt6CY9exiS51Wc0t4MrUOKN51IbOzuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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