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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ec81eb64669cdc3635cdcd3a9bea618195e3af010f7deecc9c28591bd23dc37' 
  AND token = '5a+aUNVxvkvvAyLOf1Z2DyP7/bAj0X8JXjZEzDghc1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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