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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8dfd3b7c94a4096c34951e06fd604d547203c79ed03ed8e866855f72d7856cc' 
  AND token = 'GhRtg6tztd6K3jExSwA3g98clI9+dW4b75vF+Ph9g6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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