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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a31f58b212456f49c8ab55d9c54db67592d1140d8935b3df0fa54cf9ae1f301e' 
  AND token = 'EmFBpvXG7le5KPUqPY77gSpCB1T1RLfRYER5kfL4des=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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