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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13d15406f67d0ae0040f1cb46bd1b18be88848d2b41c773861ccc5d7f7d2b7df' 
  AND token = '/Z6yVFViUVLJiWRxEzkc3kSLHaVMi7rVbwpFXQsyMvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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