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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05f8e72b06830368ca744ea1fa261b6a6ab5b7669794a2a36d7512688f08213a' 
  AND token = 'BLrpUIv4Na5SWTbAsXEdf5l1f2yjwzfLznweakSpyWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00101

JSON explain

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