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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc5c79e161b6d01bea211badcd1b5b54f7384e22b3b3e0ea2ecd27ee9f5785a9' 
  AND token = 'hmMk7jAaLz4j+7ldFqH5akuFUc6ecYdCi4t3zw7BPmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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