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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae9fe5d92550e6292c6f1d5493affd6a8661adb6a55a49717f3e6954bc323f0a' 
  AND token = 'UTRsASXr/UPJU5RbbYks+HxKIU0oZQj+yAtxX786CE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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