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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ee5737f1d24fca34bc6295efdeacf0f67265c19d018d20db99028870eebe0f2' 
  AND token = 'fcKtWGZILqhdmcFVbtpdLK7t4A4sxDS7QebhnmkB0AA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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