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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c87de14bca154ba0d8b9eec9186076f026afd6837ae09e74826d9ef2e47dd27' 
  AND token = '0iDACSoU2ksRZ4F7AVx+lUZU4v04nqAjEb0I7b6DSPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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