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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b524446e0ff6273100c1f4431e8317eae1fd326aeaef1598163b2454409cb6f7' 
  AND token = '5MyZwNQTc2DlJxjNNGudB/oamNslpb6I9oHcXGkMcCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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