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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a00d1d21e063785f0937677a73ab4a9202ade955893352aef2ae22eb29bb64b0' 
  AND token = 'mo9MJibM7MdAfyIuUhiwm8cAf58wmIF5v8nKtlzVTHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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