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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b770c3f34b785661bf6129cb4e53059e98569dc00d57b05384d23f39ae710007' 
  AND token = 'Lg6kcaQBsMjO4rKHo0EqXb7vmWggiDe+OprRrVpW30A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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