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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3419fc16cd5f1c4b5fe94ac35b098cfce7f0a6f336b6b95208bd0db5e570507' 
  AND token = '7dhRQDxWea2qKc0P+ofYTRpr6Wggs3uOT0mli5QUPxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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