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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bdb5b4ac277fe7b6e59421ac4344afb2c989ba1f6154d7409768712d075d409' 
  AND token = 'yLOy9UPtDf4v5kmdLYB3kL6uFy8THFmooE8s80mOcBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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