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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20f250a2fadf421c18d408ecae679e473cabe6fdee58e0b736ca5940b8ec6020' 
  AND token = 'HBxSV2D5bmn8Fbf+71Yqh2s8OxYgX2WIrwYmuJA2qOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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