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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '851bacb43976ddca1f5b7755b2f7b233f33dd18ae7365f0d56ec6845c7d3af85' 
  AND token = 'bzcoNrXfsPoOgqBLn+WMwVo1CVksXQAP47ibX3e57J0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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