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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36bc8ca367657048e734fe76c1787f709d03f7290cc9bb0a14ac8cd7618456f9' 
  AND token = '1Bj/6s4T6RQv67JmZRKRQTzM8h111NlrnSnFMz0sdSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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