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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f32929f1521f71835f9df50ce6d958f5adc3690a56fed995447ee5a0accb9cb' 
  AND token = 'O3HN/iI8BG5x/76Ix75wdKR98BDIJRBOYTWjySg6gxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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