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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '932aea8e3eb0e1e4c3863d1cc4b5f7becebac8793db453ff60b74c80f6edae70' 
  AND token = 'yZGZSoVUvFJrutASkEtTQw/qs4N+GbuuI6XqpdC/WsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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