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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38d1c9a4dbe3c9f6ce5b40f3e055bcdd70a74d07110c469d1f3c108d5a092b29' 
  AND token = 'UcQoHzcRx/Fc1+irh9PFWoX5qrN8erMXY0O1JoAzksc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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