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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f12e339cd87ab8b7380ef6ab6b53961e805db0426b6b4198775dd2e440eaad2' 
  AND token = '1Zc5cRkJFoon+5uK6LycCDhXJE2MausPgfOcLOaxJX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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