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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaaf55cf165b2fc1b0567fa1509cb5fcecf8f10890389a21f85988647c52d0f5' 
  AND token = 'YD9HXOlig8PBf50IdkDqtwKoHjn0lve1m6Vd5PDXRlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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