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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '002ddec83ad7bc6f4c1e5f22f27b0a781fcdc3d3d9c0b02e72066a4dd2df1f57' 
  AND token = 'jY2n84XyJ6LQMWeULhCYJGWn+z95B0zXUKiQt7Y+JR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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