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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fa7bd0bf71044ba24e22300596157bd2ad1c78e2769754bcdc3a3dd845cbca8' 
  AND token = 'jlr1xrXsaMOa12xWRyln4B0vpiWhuMB/ZWMQIM6SmEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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