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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baa8b51e2c34afad825d9539be1876e6abd34c0999d57f7f8765a1fc8bb618d3' 
  AND token = '1SWV6ZF9cDkn5T/qyESxI6K3D1opkduqQ55unufYGUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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